About Us

Tiller designs, develops and manages high-impact events, meetings, conferences, and trips. We believe in a hands-on approach and value working directly with clients to build customized programs.

Regardless of your strategic objective, we support your goals with a unique combination of high-touch project management complemented by content development expertise and a solid foundation in logistics and implementation. We have worked with organizations large and small, and on programs both high-profile and confidential in nature.

Our leadership team boasts years of experience working with world leaders, CEOs, philanthropists, and other high-profile clients. We work across the United States and around the world to support innovative programs with a meaningful purpose.


Todd Dennett
Founder and CEO

Todd oversees business development and works with clients to develop and implement successful strategies to maximize the effectiveness of travel and events. His work includes strategic planning, project management, content development, event planning, and trip management for clients including the Bill & Melinda Gates Foundation, the Alliance for Climate Protection, the International Olympic Committee, and the United Nations Foundation.

His extensive portfolio of work includes serving as event director for the Giving Pledge Annual Gathering, protocol manager for four Olympic Games, and associate producer of the 2008 Democratic National Convention. He has also designed and led more than 30 high-level delegation trips in developing countries that have generated support for critical global health and development issues.

Todd began his career in the White House managing international projects for Vice President Gore, and has since worked supporting the global needs of his clients throughout the U.S., Africa, Asia, Europe, and Latin America.

Todd holds a master of business administration from the University of Washington and a bachelor of arts in international affairs and communications from The George Washington University.

Jill Culver
Vice President

Jill draws on more than 15 years of event planning experience to expertly manage events and conferences for Tiller clients. She specializes in complex conference logistics, management, and execution.

Jill’s portfolio includes development and management of events with clients in industries spanning technology, hospitality, fashion, financial services, entertainment, and food and wine. Her client roster includes Washington Global Health Alliance, Microsoft, the Bill & Melinda Gates Foundation, Seattle Children’s Hospital, Sub Pop Records, and the National Organization for Women. She is just as comfortable producing a scientific conference for more than 1,000 attendees as she is discussing floral concepts for an intimate reception.

Prior to joining Tiller, Jill served as events director for Fred Hutchinson Cancer Research Center’s HIV Vaccine Trials Network, where she led a team that managed multiple simultaneous large-scale conferences, bringing together representatives from 28 offices worldwide. She also held senior event planning roles at Wild Ginger, The Triple Door, and the University of Washington.

Jill holds a bachelor of arts in communications from the University of Washington.

Maureen-newMaureen Sweeney
Vice President

Maureen leads project teams for Tiller. She excels at negotiating complex organizations and coordinating programs involving high-profile clientele.

Maureen’s career spans language, protocol, and events management for global organizations and worldwide programs. She has held senior-level staff positions and advisory roles for the International Olympic Committee, the United States Olympic Committee, and nine Olympic Organizing Committees. In addition, Maureen has supported other international organizations including the Clinton Global Initiative, the Bill & Melinda Gates Foundation, and One Heart World-Wide. Recently, Maureen served as event manager for the 2013 Global Vaccine Summit in Abu Dhabi. Maureen worked as the Protocol/Green Room manager at CGI, which hosted as many as 120 heads of state and government at a single meeting, as well as numerous celebrities, politicians, and international philanthropists.

She holds a master of public administration degree from the Monterey Institute of International Studies and a bachelor of arts in international relations with a focus on Latin America from the University of Oregon.

elizabeth-portraitElizabeth Gibbs
Senior Project Manager

Elizabeth manages projects, plans logistics, implements strategy, and leads trip-planning for Tiller clients. With extensive experience working with high-profile groups, she has developed and designed learning and advocacy trips throughout the U.S., Europe, Africa, and Asia.

Elizabeth excels at managing complex projects spanning multiple time zones, languages, and cultures to build programs that consistently exceed expectations. She ensures that her client’s strategic vision is clearly defined and implemented.

Elizabeth’s clients have included organizations such as the United Nations Foundation, the Bill & Melinda Gates Foundation, ONE, and the Ireland Funds. Elizabeth joins Tiller from a strategic management consulting firm in Dublin, Ireland.

Elizabeth holds a master of education from Trinity College in Dublin and a bachelor of science in business administration from the University of Richmond.

sarah-van-millSarah Van Mill
Project Manager

Sarah manages projects and events for Tiller clients. She brings a broad range of experience from working in the non-profit, public, and consulting sectors.

Prior to joining Tiller, Sarah spent five years in the transportation field working on high-profile, cutting-edge and politically volatile projects. Before that, she worked for socio-economic justice in South Africa. She excels at defining project strategy and implementing the details to achieve client goals.
Sarah holds a master of philosophy in justice and transformation from the University of Cape Town and a bachelor of arts in sociology from the University of Notre Dame.

EmmaEmma Swanhuyser
Project Coordinator

Emma provides Tiller clients with comprehensive support to meet and exceed their program goals. Her multi-disciplinary background spans the fields of nonprofits, global health, and events.

Prior to joining Tiller, Emma worked for the University of Washington’s Institute for Health Metrics and Evaluation, where she supported communications and public policy outreach programs. Previously, she aided operations and events at the Washington Global Health Alliance and managed high-profile guests for KING 5 News. Emma also has extensive experience in guest relations through her work coordinating successful corporate conferences.

Emma holds a bachelor of arts in medical anthropology and global health and a minor in Spanish from the University of Washington.